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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.launcher3.util;
import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
import android.content.Context;
import android.graphics.Point;
import android.hardware.display.DisplayManager;
import android.hardware.display.DisplayManager.DisplayListener;
import android.os.Handler;
import android.os.Message;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Display;
import android.view.WindowManager;
import java.util.ArrayList;
/**
* Utility class to cache properties of default display to avoid a system RPC on every call.
*/
public class DefaultDisplay implements DisplayListener {
public static final MainThreadInitializedObject<DefaultDisplay> INSTANCE =
new MainThreadInitializedObject<>(DefaultDisplay::new);
private static final String TAG = "DefaultDisplay";
public static final int CHANGE_SIZE = 1 << 0;
public static final int CHANGE_ROTATION = 1 << 1;
public static final int CHANGE_FRAME_DELAY = 1 << 2;
private final Context mContext;
private final int mId;
private final ArrayList<DisplayInfoChangeListener> mListeners = new ArrayList<>();
private final Handler mChangeHandler;
private Info mInfo;
private DefaultDisplay(Context context) {
mContext = context;
mInfo = new Info(context);
mId = mInfo.id;
mChangeHandler = new Handler(this::onChange);
context.getSystemService(DisplayManager.class)
.registerDisplayListener(this, UI_HELPER_EXECUTOR.getHandler());
}
@Override
public final void onDisplayAdded(int displayId) { }
@Override
public final void onDisplayRemoved(int displayId) { }
@Override
public final void onDisplayChanged(int displayId) {
if (displayId != mId) {
return;
}
Info oldInfo = mInfo;
Info info = new Info(mContext);
int change = 0;
if (info.hasDifferentSize(oldInfo)) {
change |= CHANGE_SIZE;
}
if (oldInfo.rotation != info.rotation) {
change |= CHANGE_ROTATION;
}
if (info.singleFrameMs != oldInfo.singleFrameMs) {
change |= CHANGE_FRAME_DELAY;
}
if (change != 0) {
mInfo = info;
mChangeHandler.sendEmptyMessage(change);
}
}
public static int getSingleFrameMs(Context context) {
return INSTANCE.get(context).getInfo().singleFrameMs;
}
public Info getInfo() {
return mInfo;
}
public void addChangeListener(DisplayInfoChangeListener listener) {
mListeners.add(listener);
}
public void removeChangeListener(DisplayInfoChangeListener listener) {
mListeners.remove(listener);
}
private boolean onChange(Message msg) {
for (int i = mListeners.size() - 1; i >= 0; i--) {
mListeners.get(i).onDisplayInfoChanged(mInfo, msg.what);
}
return true;
}
public static class Info {
public final int id;
public final int rotation;
public final int singleFrameMs;
public final Point realSize;
public final Point smallestSize;
public final Point largestSize;
public final DisplayMetrics metrics;
private Info(Context context) {
Display display = context.getSystemService(WindowManager.class).getDefaultDisplay();
id = display.getDisplayId();
rotation = display.getRotation();
float refreshRate = display.getRefreshRate();
singleFrameMs = refreshRate > 0 ? (int) (1000 / refreshRate) : 16;
realSize = new Point();
smallestSize = new Point();
largestSize = new Point();
display.getRealSize(realSize);
display.getCurrentSizeRange(smallestSize, largestSize);
metrics = new DisplayMetrics();
display.getMetrics(metrics);
}
private boolean hasDifferentSize(Info info) {
if (!realSize.equals(info.realSize)
&& !realSize.equals(info.realSize.y, info.realSize.x)) {
Log.d(TAG, String.format("Display size changed from %s to %s",
info.realSize, realSize));
return true;
}
if (!smallestSize.equals(info.smallestSize) || !largestSize.equals(info.largestSize)) {
Log.d(TAG, String.format("Available size changed from [%s, %s] to [%s, %s]",
smallestSize, largestSize, info.smallestSize, info.largestSize));
return true;
}
return false;
}
}
/**
* Interface for listening for display changes
*/
public interface DisplayInfoChangeListener {
void onDisplayInfoChanged(Info info, int flags);
}
}
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